Valverde and Contador, can they ever be consider clean again, after the unerasable advantage they gave themselves over others with their body-altering doping?
If you and your identical twin always train and race together, and the only difference is that the twin takes HGH, steroids, etc, during a period of his career, will you even be equals again after he goes clean? You've aged quicker. Worn from training and riding with a stronger twin you're supposed to be equal to.
Gesink and Ten Dam have long been exposed to the Erik's at Rabobank. If they managed to stay clean throughout, THAT would make a great book. With all the high hopes put on their shoulders, the bad luck, and then those people making their choices for them...that'd be epic. Like Bassons, Lemond.
The real question then is: "is one of these riders a rare epic clean hero in the making?". Just matter of factly being clean, doesn't exist at that level. If it happens, it's HUGE. I bet if any DS were whispered by an insider her trusts word-for-word "Psst, did you know that Rider X is actually totally clean, he FAKES his doping to try and win trust of others, but he's not on the program. He's on some herbal plan, and icks his fruits and meat at the market. Real wacko that on", the DS would be sincerely baffled.